prepaid energy meter

Seminar on
Prepaid Energy
meter

By
Kamal Lochan Samal
0901106195

Introduction

 What is an energy meter ?

 What is a prepaid energy meter ?

 Why prepaid energy meter must be used ?

Working of house hold energy meter

 Driving system.
 Moving system.
 Breaking system.
 Registering system.

Internal view of Induction type energy meter

DISADVANTAGES OF INDUTION TYPE ENERGY
METER
 Induce human error while noting down the
reading
 Amount of electricity consume in rupees is not
displayed
 Creeping can cause significant error

Block diagram of Prepaid energy meter

Overall charcteristics of prepaid energy meter
 Methodology.
 Collection of revenues.
 Loading the credit revenue into the meter.
 Decrementing the revenue.
 Providing the alarm.
 Disconnection.
 Security of transactions.
 Unloading the revenue.

Components of prepaid energy meter
 EEPROM IC (Smart card)
 AT89S52
 16*2 LCD
 ULN2003
 AT2402
 Digital energy meter

EEPROM IC
 It is called as smart card.
 It is a electrical erasable read only memory.
 It is to upload the amount recharge in form of
electrical energy.
 The contents are automatically deleted once it is
inserted inside the card reader.

AT89S52
 It belongs to family of microcontrollers.
 It has total 40 pins.
 32 I/O lines.
 8K flash memory ROM and 256K RAM.
 It operates at 33KHz frequency.
 Addressing similar to 8051 microcontroller.
 Only pin nos 12,31,40,34-39,22,21,25,28 are used for
our purpose.

ULN2003
 It consists of seven independent darlington
connection.
 It acts as a current amplifier circuit.
 It is used to run a high voltage/current peripheral
circuits.
 When input terminal is high it offers low
impedance path other wise it offers a high
impedance.
 Any two input and output are used for our
purpose.

AT2402 and 16*2 LCD display
 Chip is used to read data from eeprom through
card reader.
 All the data are transmitted serially in 8 bit words.
 It also verifies the code prior to read
operation(PSC).
 16*2 LCD display has two row screen and each
row displays 16 digit at a time.
 It also acts as a tariff indicator, indicates amount
of electricity consume and remaining.

Digital energy meter
 ADE7757.

 7805(voltage regulator).

 MCT2E(opto coupler).

Working principle of digital energy meter
 Output in form of frequency.
 Energy consume proportional to output
frequency.
 Relatively cheaper meter.
 Human error are reduced while calculating.
 Opto coupler is used for calculation of pulses.
 Output frequency can be selected for other
purpose also , such as running a stepper motor an
electromagnetic register.

Circuit diagram of prepaid energy meter

Benefits to consumers
 Pay as you go.
 No need to stand in queue.
 No surprising bills.
 No bill disputes.
 Allow customer to budget expenses.
 Help customer contribute towards energy
conservation.

Benefits to utilities
 Up front payment for electricity.
 Lower overheads.
 No billing hassles.
 No disconnection/reconnection.
 Tamper and fraud detection.
 Money and time based load connection and
disconnection.
 Load/demand control.

prepaid energy meter

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